The infection of files by malicious programs, software and files could take different forms. The expressions given represents programs capable of damaging computer files.
Trojan horse are described as programs which are appears to be innocuous or harmless. Hence, using these medium to penetrate into our computer files.
Worms describes malwares which are capable of splitting from one single or independent malware so theu could spread through a network of computers.
Viruses creeps into a computer when they become attached to a file or program. This infecting computers upon the installation or download of such file.
Therefore, all stated programs causes damage to computer and file system.
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